Union Operation with Hashing

[sj538]

Suppose we are given two arrays and we have find heir mathematical union operation .This can be done easily with the use of HashMap/Hashing in Java.
Eg

arr1=[2,3,4,5,6,8,9 ]
arr2=[1,3,5,10]

Union will be [1,2,3,4,5,6,8,9,10]

[sj538]

Please assign me this issue.

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